Networks
I have 2 routers connected with 1M leased line. However, the transmission rate is 20kbps only. Any solutions/steps for troubleshooting it?
Thx
by ebob
1 - How are you measuring the "20K"? If this is what you're observing between 1 wkstn at Network A communicating across the "WAN" with a system at Network B, then maybe that's OK. Remember that your "1M" is going to be shared among ALL the systems communicating across the line, so 20K might just be "your slice of the pie".
2 - Your routers have some sort of built-in diagnostics to tell you how much traffic they are processing. For example, on a Cisco, a real simple diagnostic starts with "show int s0" to see the statistics on serial interface Zero. From there, you'll have to work with a network "engineer" type to dig further into the diagnostics of your particular gear.
3 - What does your carrier offer in terms of diagnostics?
4 - There are several good 3rd party tools, hardware/software that can be used to diagnose this link. I quite like the various tools from Fluke. If you don't want to buy these, then you can get an engineer in from a network consultant.
by ebob
I think most people expect to get 1544Kbps on a T1. But this is the "raw" bandwidth. It is important to factor in several layers of overhead, including packetising/de-packetising, application (FTP) overhead (like CRC), hardware error checking, and so on. All of these eat up BW.
The boxes themselves (wkstn and server) also generate their own traffic. There's little Ethernet broadcasts (ARPs and the like) for example. While they don't generally get propagated by the routers, the router does have to spend a couple of CPU cycles determining to ignore such data. And some O/S's (especially Macintish and Windoze) generate all sorts of extra traffic of their own more or less proprietary protocols (e.g., AppleTalk, NetBIOS/NetBEUI) and proprietary takes on standard protocols (e.g., WINS). If any of these are present, even if they're not being propagated across the WAN, they do consume cycles on the routers, which will result in lowered performance. Not to mention what might happen if this traffic gets onto your WAN link...
So 160Kbps between application devices (wkstn <--> server) might not be so bad. I suggest that your next step is to get a traffic analyser on the WAN link and see what other traffic is present (if any). It could be "sneaking in" from some surprising sources.
by kenny.fok
by mel "blazing_saddles" dundee
What is your clockrate set to or do your routers automatically determine this ?
If your leased line is point to point and it is setup properly you may have a line problem check your router interface stats.
If you are not running any errors or filtering I suggest possibly check your line is genuinely 1m it might be 19k
by kenny.fok
by kenny.fok
First What cir do you have for the line 75%, 50%, that will be the real speed of the line.
Be sure to be only you, to be the one using the line, remember that everyone connected to both sides of the lan, might talk to the other side.
Protocols: Besure to have an ip network, not a "transparent link", in this case all broadcast from lan a will be forwarded to lan b and viceversa.
Set up a network analizer in one extreme of the network and start capturing every packet type from everybody who is talking to the lan card of the router. Do not have to be an expert to find strange things happening, like radio broadcast, video broadcast, bad resolution packets reaching the wrong network first, and so on.
When these issues were isolated, perform an ftp of a big size file (>5 MB) and calculate the time it takes. If it is more longer than expected, It's time to call to your provider with the results of the previous effort, otherwise he may say "1M it's not enough to hold your network traffic!
by kenny.fok
by ann777
1mbit leased line should not be so slow. Are you sharing this line? What is your CIR? You spoke of two routers... how many users? What sort of services are you running through this? One workstation to --> ftp server shouldn't be a problem either. What sort of workstation is this specifications-wise? Have you spoken with your ISP?
by kenny.fok
by kenny.fok
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